Question about Zenith R49W36 49" Rear Projection HDTV

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Zenith TV PV4667RK

Set works fine for about 35 to 45 minutes then screen goes black still have sound. turn set off for about 2 hrs picture will come back for about 35 to 45 minutes.



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Re: Zenith TV PV4667RK

This sounds like a thermal intermittent, either a component or a connector or most likely a solder joint.

when it heats up it expands losing its connection if its a solder joint. if its a component its a lot more complex.

i dont know your electronic/mechanical experience, a projection tv is very complex inside, several circuit boards, dozens of wiring connectors a whole lot of very high voltage, enough to be fatal and if not at least very painfull.

if you are experienced and able check all the solder connections on every circuit board under a magnifier, repair any bad ones.

after that the trouble shooting gets very complex as it must be done with the boards opened up and exposed while the set is running, you will require a set of schematics, component freeze spray, a spot heating gun, a high impedance meter, an oscilloscope, temperature controlled soldering equipment and possibly a signal injector of some sort.

if its worse than a bad solder joint it is probably best left to a service shop.

best of luck.


Posted on Oct 17, 2007

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